Maintenance release for v0.4.x series.

FIXES:

fd02e63 neovim#12701 ui: fix problem with sattr_T overflow
3e3002b neovim#12710 fs: Ensure FileInfo struct is initialized
e4629f2 neovim#12496 main.c: fix hang issue with recoverymode neovim#12520
f558af8 neovim#12209 fixed hang issue with --headless and -r option specified
cda1190 neovim#12180 TUI: block signals on suspend
8399f73 neovim#12142 Fix issues revealed by gcc10 setting -fno-common by default
5e47cf2 netrw.vim: do not save +/* registers
5d41bfc neovim#11907 quickfix.c: Fix vimgrep regression
641e229 neovim#11903 screen: add missing redraws after a message
47bd62c loop_close: close all handles
d273036 loop_close: call uv_stop(), fix bug
284b398 neovim#11821 loop_close: timout after 2 seconds
1b2666c messages: echo "line1\r\nline2" should not clear line1
1bf90bf neovim#11651 API: fix crash on copy_object(kObjectTypeWindow)
fafd636 neovim#11566 libcallnr: Use int, not int64_t, as the return type for Vim compat
972dd75 neovim#11460 win_line: Fix crash with 'rightleft' in :terminal
4c48cf3 f_getenv/setenv: Access v_special when v_type is VAR_SPECIAL
2cd1ff7 neovim#11360 paste: Select-mode, Visual-mode